JP5481307B2 - Motor salient pole concentrated winding stator - Google Patents

Description

  The present invention relates to a salient pole concentrated winding stator of an electric motor mounted on an electric vehicle.

  As a conventional stator for an electric motor or a generator, a coil in which a winding is preformed for each pole is inserted into an insulator, and this insulator is further inserted into a tooth portion formed in an annular stator core. An electric machine is known (for example, refer to Patent Document 1).

  In the stator 100 described in Patent Document 1, as shown in FIG. 23, adjacent in-phase coils 113 are connected by joining the windings 114 to each other. By holding in the groove of the flange portion 112a provided in the phase insulator 112, the vibration of the crossover portion 114T is suppressed.

JP 2008-31290 A

  However, in the stator 100 described in Patent Document 1, since the adjacent in-phase coils 113 are connected (connected), the manufacturing process becomes complicated. In addition, since the insulator 112 is provided with the flange portion 112a to hold the crossing portion 114T, the shape of the insulator 112 becomes complicated.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a salient pole concentrated winding stator capable of suppressing vibration of a transition portion of a winding by a simple method.

In order to achieve the above object, the invention according to claim 1
A coil (for example, a coil 13 in a later-described embodiment) wound around adjacent teeth (for example, a tooth 11b in a later-described embodiment) of a stator core (for example, a stator core 11 in a later-described embodiment) is out of phase. , A salient pole concentrated winding stator (for example, a bump in an embodiment described later) of an electric motor (for example, an outer rotor type electric motor 1 in an embodiment described later) wound with a winding (for example, a para winding 14 in an embodiment described later). A pole concentrated winding stator 10),
A coil wound around each tooth includes a first winding end (for example, a first winding end 41 in an embodiment described later) positioned on the radially outer side on one axial end side of the stator and one axial end of the stator. A second winding end (for example, a second winding end 42 in an embodiment described later) located on the radially inner side of the side,
One of the first winding ends of the adjacent in-phase coils and the other second winding end of the same-phase coils are wound with the same winding by a crossing portion (for example, a crossing portion 14T in an embodiment described later) straddling a different phase coil. Connected by
A plurality of the transition portions provided in the circumferential direction are collectively held by a holding member (for example, holding clips 70 and 70A in an embodiment described later).

In addition to the configuration of claim 1, the invention according to claim 2
An outer winding support portion (for example, an outer winding support portion 30 in an embodiment described later) is provided radially outward from the first winding end,
An inner winding support portion (for example, an inner winding support portion 34 in an embodiment described later) is provided radially inward from the second winding end,
The crossover portion is locked on the radially outer side of the outer winding support portion on the first winding end side, and on the radially inner side of the inner winding support portion on the second winding end side,
The transition part is connected to the coils of the same phase adjacent to each other via the outer winding support part and the inner winding support part,
The holding member has a transition holding part (for example, a transition holding part 72 in an embodiment described later) having an opening on the side facing the coil in the axial direction,
The angle of two holding walls (for example, holding wall 74 in the embodiment described later) sandwiching the crossing portion from both sides of the crossing holding portion is the vertex of one outer winding support portion of one of the adjacent in-phase coils. It is characterized in that it is inclined in the circumferential direction with respect to a straight line connecting the apex of the other inner winding support part.

  The invention according to claim 3 is characterized in that, in addition to the configuration of claim 1 or 2, the angles of the two holding walls are alternately different in the circumferential direction.

  The invention according to claim 4 is characterized in that radial positions at which the crossing portions are held by the holding members are alternately different in the circumferential direction.

  According to a fifth aspect of the present invention, in addition to the structure of any one of the first to third aspects, the holding member includes a locking position on the outer side in the radial direction of the outer side winding support part of the transition portion and the inner side winding. A substantially central portion of the locking position on the radially inner side of the support portion is held.

According to a sixth aspect of the present invention, in addition to the structure of any of the first to fifth aspects, the holding member is a transition holding portion (for example, a transition in an embodiment described later) that opens on the side facing the coil in the axial direction. Holding part 72),
The crossover holding part has two holding walls (for example, a holding wall 74 in an embodiment described later) sandwiching the crossing part from both sides,
Each of the two holding walls is provided with a holding claw (for example, a holding claw 75 in an embodiment described later) at each open end,
The gap between the holding claws is smaller than the diameter dimension of the winding of the transition portion.

In the invention according to claim 7, in addition to the structure of any one of claims 1 to 6, the transition portion is bent into a substantially S shape,
The holding member is characterized by opening so as to follow the shape of the crossing portion.

  According to the first aspect of the present invention, it is possible to suppress the vibration of the transition portion by the holding member, and to suppress the insulation failure due to the winding breakage or the friction with the other phase. Furthermore, the insulator does not need to be specially processed to hold the transition portion, and the insulator shape can be prevented from becoming complicated.

  According to invention of Claims 2-4, a transition part can be hold | maintained more firmly.

  According to the fifth and seventh aspects of the invention, the stomach can be restrained when the crossing portion vibrates.

  According to invention of Claim 6, it can suppress that a transition part remove | deviates from a holding member.

It is a principal part longitudinal cross-sectional view of the outer rotor type electric motor to which the stator of 1st Embodiment of this invention is applied. It is a front view of the stator in FIG. It is a front view of a stator core. It is a perspective view of an insulator. It is a front view of an insulator. It is a front view of the coil by which the coil | winding was wound by the insulator. It is a conceptual diagram which shows the state by which the coil group for 3 phases was arranged in the step shape. It is a conceptual diagram which shows the insulator row | line | column before winding is wound. It is a figure which shows the coil group for 1 phase. It is a conceptual diagram which shows the procedure which arranges the coil for three phases arrange | positioned at step shape in a line. It is a figure which shows the procedure which arranges the coil arrange | positioned at step shape in 1 row of the same height about the coil group for one phase, (a) is a front view, (b) is the side view seen from XI (C) is the bottom view seen from XI '. It is a figure which shows the procedure which arranges the coil arrange | positioned at step shape in 1 row of the same height about the coil group for one phase, (a) is a front view, (b) is the side view seen from XII (C) is the bottom view seen from XII '. It is a figure which shows the procedure which arranges the coil arrange | positioned at step shape in 1 row of the same height about the coil group for 1 phase, (a) is a front view, (b) is the side view seen from XIII (C) is the bottom view seen from XIII '. It is a figure which shows the procedure which aligns the coil arrange | positioned at step shape in 1 row of the same height about the coil group for one phase, (a) is a front view, (b) is the side view seen from XIV (C) is the bottom view seen from XIV '. It is explanatory drawing which shows the state which mounts | wears with the tooth | gear of a stator core with the 1 phase insulator by which the coil | winding was wound. It is a fragmentary perspective view of a stator. (A) is a perspective view of the holding clip seen from the cross holding part side, (b) is a perspective view of the holding clip seen from the opposite side to (a). It is a perspective view of a crossing holding part. It is sectional drawing of the holding clip which hold | maintained the transition part. It is a front view of the stator of 2nd Embodiment of this invention. It is explanatory drawing which shows the state which mounts | wears the teeth of a stator core with the insulator by which the coil | winding was wound. (A) The front view of the holding clip which hold | maintained the transition part, (b) is sectional drawing of (a). It is explanatory drawing of the stator of patent document 1. FIG.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings are viewed in the direction of the reference numerals.

<First Embodiment>
First, an electric motor to which the salient pole concentrated winding stator according to the first embodiment is applied will be described. FIG. 1 is a longitudinal sectional view of an essential part of the outer rotor type electric motor according to the first embodiment. The electric motor of this embodiment is an outer rotor type electric motor 1 having a three-phase eight-pole pair, and is disposed on a stator 10 fixed to a motor housing 2 with bolts 3 and on the outer peripheral side of the stator 10 via a slight gap. And an annular rotor 4.

  The rotor 4 has an annular rotor body 6 in which a magnet 6b is embedded in a rotor yoke 6a formed by laminating electromagnetic steel plates, and is fixed to an edge inner peripheral surface 5a of a rimmed disk-shaped support member 5, and a motor housing 2 is fixed to a rotating shaft 8 that is rotatably supported by ball bearings 7 and 7 that are fitted in the shaft 2. The rotor 4 is rotationally driven by a rotating magnetic field generated in the stator 10. A resolver 9 that detects the magnetic pole position of the rotating shaft 8 is disposed between the base portion 5 b of the support member 5 and the stator 10.

  2 and 3, the stator 10 includes a stator core 11, a plurality of insulators 12, a plurality (24 in the present embodiment) of coils 13 (13u, 13v, 13w), and a single piece to be described later. Holding clip 70. The stator core 11 is formed by laminating a plurality of electromagnetic steel plates in the axial direction of the stator 10, that is, in a direction perpendicular to the paper surface in FIG. 3, and is formed to project radially outward from the annular support portion 11a. A plurality (24) of teeth 11b are arranged in the circumferential direction. The coil 13 is formed of a predetermined number of conductive wires 14 (in this embodiment, a para-winding composed of two conductive wires, hereinafter referred to as a para-winding) 14 made of a synthetic resin having insulating properties. It is formed by winding around each tooth 11b of the stator core 11 by means of salient pole concentrated winding via the insulator 12 made.

  Each of the coils 13 includes eight U-phase, V-phase, and W-phase three-phase coils, and the U-phase coil 13u, the V-phase coil 13v, and the W-phase coil 13w are arranged in this order in the clockwise direction. Are arranged around the teeth 11b. That is, the in-phase coils 13 (for example, the U-phase coil 13 u) disposed across the other-phase coils 13 (for example, the V-phase coil 13 v and the W-phase coil 13 w) straddle the other-phase coils 13. It is connected by the crossing part 14T routed.

  The eight U-phase, V-phase, and W-phase coils 13u, 13v, 13w of each phase are continuously wound by the same para-windings 14u, 14v, 14w, respectively, and a three-phase coil group 18 ( 18u, 18v, 18w). One end of the U-phase para-winding 14u is connected to the U-phase connection terminal 15u, and one end of the V-phase para-winding 14v is connected to the V-phase connection terminal 15v. One end of 14w is connected to W-phase connection terminal 15w. The other ends of the U-phase, V-phase, and W-phase para-windings 14 u, 14 v, 14 w are connected to the midpoint terminal 16.

  A plurality (six in this embodiment) of convex portions 11c each having a bolt hole 17 are formed on the inner peripheral side of the support portion 11a of the stator core 11. The stator 10 is fixed to the motor housing 2 by the bolt 3 inserted through the bolt hole 17 (see FIG. 1).

  As shown in FIGS. 4 and 5, the insulator 12 includes a body portion 24 around which the para-winding 14 is wound, an outer peripheral side flange portion 25 and an inner peripheral side provided at both radial ends of the body portion 24. And a collar portion 26. The body portion 24 has a rectangular hole 24a penetrating in the radial direction by the walls 20 and 21 facing in the axial direction of the stator 10 and the walls 22 and 23 facing in the circumferential direction of the stator 10. It is formed in a cylindrical shape. The size of the square hole 24a is slightly larger than the teeth 11b of the stator core 11, and the teeth 11b can be inserted therethrough. A plurality of concave grooves 27 for positioning the para-winding 14 when the para-winding 14 is wound are provided in the walls 22 and 23 in a direction orthogonal to the axis of the square hole 24a. .

  An outer partition wall 28 extending outward in the radial direction is formed at the end of the outer peripheral flange 25 on the wall 20 side. An outer winding projecting toward one axial end opposite to the body portion 24 in the axial direction is provided at a corner between one circumferential end surface (left end surface in FIG. 5) 28a and the radially inner side surface 28b of the outer partition wall 28. A support portion 30 is formed. The outer winding support 30 has a side C connecting the radial intermediate portion of the circumferential one end surface 28a of the outer partition wall 28 and a portion of the radially inner side surface 28b that is approximately ３ center from the circumferential end. A portion near the inner side of the circumferential one end surface 28a and a portion near the one circumferential end of the radially inner side surface 28b extend in the axial direction to form a substantially triangular prism shape. The tops of the radially outward inclined surface 30c formed by extending the one side C in the axial direction and the end surface 30d extending in the axial direction of the circumferential one end surface 28a of the outer partition wall 28 are formed in a curved shape. The curved surface 30b is configured.

  Further, a step portion 30 a parallel to the one side C is provided between the radially outward inclined surface 30 c of the outer winding support portion 30 and the outer partition wall 28. Furthermore, a guide protrusion 31 having a side surface substantially parallel to the one side C is formed at the intermediate portion in the circumferential direction of the outer partition wall 28 and at the radially inner portion thereof, facing the radially inner portion of the inclined surface 30c. Yes. A groove 32 is formed between the inclined surface 30 c of the outer winding support 30 and the side surface of the guide protrusion 31.

  Moreover, the axial direction one end side part of the inner peripheral side collar part 26 is formed so as to be gradually widened from the one end surface side in the circumferential direction toward the other end surface (right end surface in FIG. 5) when viewed from the radial direction. In addition, as viewed from the axial direction, the thickness is gradually increased from the circumferential intermediate portion toward the other circumferential end surface. A substantially triangular prism-shaped inner winding support 34 that protrudes toward one end in the axial direction is provided at the corner between the other circumferential end surface and the radially outer side surface of the inner circumferential flange 26. In addition, an inclined surface 33 that is inclined inward in the radial direction from the circumferential intermediate portion toward the other circumferential end surface is formed at one axial end side portion of the inner circumferential flange portion 26. A groove portion 35 is formed to face the radially inward inclined surface 34a of the inner winding support portion 34. Further, a parallax that is first wound along the wall 20 from the other end surface side in the circumferential direction to the one end surface side in the circumferential direction at the boundary portion between the axial end portion of the inner peripheral side flange portion 26 and the wall 20. A guide portion 36 that is inclined with respect to the inner peripheral side flange portion 26 that guides the winding 14 is formed, and between the guide portion 36 and the inner peripheral side flange portion 26, a groove portion 35 is connected to the trunk portion. A step portion 36a for guiding the para-winding 14 heading to 24 in the axial direction is formed.

  Further, the outer winding support portion 30 and the inner winding support portion 34 of the insulator 12 are such that a virtual straight line M connecting the outer winding support portion 30 and the inner winding support portion 34 passes through a circumferential intermediate portion of the insulator 12. Therefore, the length of the transition portion 14T can be shortened.

  As shown in FIG. 6, the coil 13 is formed by winding the para-winding 14 around the trunk portion 24 of the insulator 12 a plurality of times. The coil 13 is wound so as to start winding from one end side (the inner winding support portion 34 side) of the insulator 12 and finish winding on the other end side (the outer winding support portion 30 side). It has the 1st winding end 41 which is a starting position, and the 2nd winding end 42 which is a winding end position located in the radial direction outer side. The para-winding 14 is wound while reciprocating between one end side and the other end side of the insulator 12, thereby increasing the number of layers of the coil 13 wound around the insulator 12. The para-winding 14 extending obliquely downward along the inclined surface 33 from the first winding end 41 through the groove 35 is locked and supported by the inner winding support 34 up to the position of the inner support point E. In addition, the para-winding 14 that extends obliquely upward from the second winding end 42 through the groove 32 is wound and supported on the curved surface 30b of the outer winding support portion 30 up to the position of the outer support point D. .

  Next, a method for manufacturing the stator will be described with reference to FIGS. In the present embodiment, the U, V, and W-phases are formed by continuously winding the same para-winding 14 on the eight insulators 12 corresponding to the entire circumference of the stator core 11 via the crossing portion 14T. The coils 13 (13u1 to 13u8, 13v1 to 13v8, 13w1 to 13w8) of each coil group 18 (18u, 18v, 18w) are aligned in one row. Here, each phase has four insulators 12 each. On the other hand, the description will be simplified by taking as an example a case where the coils 13 (13u1 to 13u4, 13v1 to 13v4, 13w1 to 13w4) formed by continuously winding the same para-winding 14 are arranged in one row. FIG. 7 is a conceptual diagram showing a state in which three-phase coil groups are arranged in a staircase pattern, and FIG. 9 is a diagram showing one-phase coil groups in FIG.

  As shown in FIG. 7, the coils 13 (13u1 to 13u4, 13v1 to 13v4, 13w1 to 13w4) in which the same para-winding 14 is continuously wound around each of the four insulators 12 via the crossing portion 14T are provided. The first position L1 to the fourth level L4 are arranged in a stepped manner so that the height position becomes gradually lower. In each layer, three-phase coils 13u, 13v, and 13w of U, V, and W phases are adjacently arranged in this order.

  As shown in FIG. 8, the coil group 18 for the three phases arranged in a staircase pattern is first layered so that the twelve insulators 12 for the three phases are three by three so that the height position gradually decreases. A staircase-shaped insulator array 51 is formed in a staircase pattern from L1 to the fourth layer L4. Then, while feeding out the para-winding 14 from three nozzles (not shown), the three phases simultaneously rotate around the three insulators 12 in the first layer L1 in the clockwise direction and relatively move in the vertical direction. Then, start winding from one end side of the insulator 12 (inner winding support portion 34 side, upper side in the figure) and finish winding at the other end side (outer winding support portion 30 side, lower side in the figure). 14 is wound.

  Next, the nozzle is moved to the insulator 12 of the second hierarchy L2, and similarly to the winding of the first hierarchy L1, the periphery of each insulator 12 of the second hierarchy L2 is relatively rotated in the clockwise direction when viewed from below and is relatively moved in the vertical direction. Then, the para-winding 14 is similarly wound while sequentially moving to the third layer L3 and the fourth layer L4. (18u, 18v, 18w) are formed simultaneously.

  Alternatively, as shown in FIG. 9, the same para-winding 14 is wound around the four insulators 12 through the crossing portion 14T, so that the height position is gradually lowered from the first level L1 to the fourth level L4. The coil group 18 (for example, u-phase coil group 18u) for one phase arranged in the same manner is formed. Next, after the coil groups 18 (for example, the v-phase coil group 18v and the w-phase coil group 18w) for the remaining two phases are formed in the same manner, in each of the layers L1 to L4, the coils 13 are U-phase, V-phase, W By arranging the coils adjacent to each other so as to be in the order of the phases, a coil group 18 for three phases is formed in which 12 coils 13 are arranged step by step from one layer L1 to four layers L4. (See FIG. 7).

  Here, each coil 13 (13u1 to 13u4, 13v1 to 13v4, 13w1 to 13w4) starts to be wound from one end side (the inner winding support portion 34 side, the upper side in the drawing) of the insulator 12, and the other end side (outer winding). The first winding end 41 and the second winding end 42 of the para-winding 14 are unified so that the winding ends at the wire support portion 30 side (lower side in the figure). Further, in the present embodiment, when the para-winding 14 is wound, the groove 35 is passed so as to be locked to the inner winding support portion 34 and is locked to the outer winding support portion 30. The groove 32 is passed.

  Next, the three-phase coil groups arranged in a staircase pattern shown in FIG. 7 are arranged in a line. First, in this embodiment, the first layer L1 is set as a reference layer, and the U-phase coil 13u2 adjacent to the coil 13w1 of the first layer L1 among the coils 13u2, 13v2, and 13w2 of the second layer L2 adjacent to the first layer L1 is used. Along with the U-phase coils 13u3 and 13u4 of the third, fourth layer L3, and L4 on the opposite side of the first layer L1 with respect to the coil 13u2, so that the coil 13u2 has the same height as the first layer L1. Phase and W phase crossing part 14T is detoured and moved.

  As a result, the three U-phase coils 13u2 to 13u4 in the second to fourth layers L2 to L4 move so as to have the same height as the coils 13 in the first layer (see FIG. 10A). . That is, the U-phase coil 13u2 of the second hierarchy L2 is adjacent to the W-phase coil 13w1 of the first hierarchy L1, the U-phase coil 13u3 of the third hierarchy L3 is adjacent to the W-phase coil 13w2 of the second hierarchy L2, and the U-phase of the fourth hierarchy L4 is further increased. The phase coil 13u4 is moved next to the W-phase coil 13w3 in the third layer L3. The first layer L1 includes four coils 13u1, 13v1, 13w1, 13u2 in this order in the U, V, W, and U phases, and the second layer L2 includes three coils 13v2, V, W, and U phases. 13w2 and 13u3 are arranged in this order, and the third layer L3 has three coils 13v3, 13w3 and 13u4 arranged in this order, and the fourth layer L4 has two coils of V and W phases. 13v4 and 13w4 are arranged in this order.

  When the coils 13u1 to 13u4 described above are moved, it is necessary to move the coils 13v1 to 13v4, 13w1 to 13w4 of the other phases and the crossover part 14T so as not to interfere with each other. FIG. 11 to FIG. 14 are conceptual diagrams showing the moving procedure for the coil group 18u for one phase for easy understanding. In the coil group 18u before movement, as shown in FIG. 11, the four coils 13u1 to 13u4 from the first layer L1 to the fourth layer L4 are within the same plane (on a straight line in the side view shown in FIG. 11B). It is arranged in steps.

For the movement of the coils 13u1 to 13u4, first, while maintaining the positional relationship of the three coils 13u2 to 13u4 from the 2nd to 4th layers L2 to L4, the coil 13u2 of the 2nd layer L2 is wound on the outer side of the coil 13u1 of the 1st layer L1. In a state where the crossing portion 14T is stretched around the wire support portion 30, the wire support portion 30 is turned counterclockwise. Thereby, after the coils 13u2 to 13u4 of the 2nd to 4th layers L2 to L4 are simultaneously moved to the front of the coil 13u1 of the 1st layer L1 (see FIG. 12), each of the coils 13u2 to 13u4 has a height of 1 layer. Move upward by the amount (see FIG. 13). Thereby, the coil 13u2 of the second hierarchy L2 is located at the same height as the coil 13u1 of the first hierarchy L1. Next, the coil 13u2 is moved rearward of the coil 13u1 so that the coil 13u2 of the second layer L2 is separated from the coil 13u1 of the first layer L1, and the coils 13u2 to 13u4 are returned to the original plane (see FIG. 14). Thereby, the coil 13u2 of the second layer L2 is positioned at the same height as the coil 13u1 of the first layer L1 and on a straight line (in the same plane) in a side view. Thus, by moving the coils 13u2 to 13u4, it is possible to move while avoiding interference with the coils 13v1 to 13v4, 13w1 to 13w4 of the other phases and the crossing portion 14T.
In addition, the turning movement of the coil 13u2 of the second layer L2 matches the height of the coil 13u1 of the first layer L1, and at the same time, the coils 13u2 to 13u4 of the second to fourth layers L2 to L4 are in the same plane as the coil 13u1 of the first layer L1. It can also be done to be located in

  Thus, by moving the coil 13 upward by one layer, the transition portion 14T previously locked between the inner winding support portion 34 and the outer winding support portion 30 becomes the inner winding support portion 34. Is supported at the position of the inner support point E and the position of the outer support point D of the outer winding support 30 (see FIG. 6).

Returning to FIG. 10B, the three V-phase coils 13v2 to 13v4 in the second to fourth layers L2 to L4 are moved so as to have the same height as the coil 13 in the first layer. As a result, the first layer L1 includes five coils 13u1, 13v1, 13w1 of U, V, W, U, and V phases.
, 13u2, 13v2 are arranged in this order, and three coils 13w2, 13u3, 13w3 of W, U, V phase are arranged in this order in the second layer L2, and three layers of W, U, V phase are arranged in this order. The coils 13w3, 13u4, 13v4 are arranged in this order, and the fourth layer L4 is in a state where one coil 13w4 of W phase is arranged.

  In this way, when the coils 13 of the in-phase coil group 18 including the coils 13 of the second layer L2 adjacent to the coils of the first layer L1 are sequentially moved upward by one layer, all the coils 13 are the same. By repeating until the height is reached, all the coils 13 are aligned in one row as shown in FIG. Therefore, in the case of this embodiment, all the coils 13 (13u1 to 13u8, 13v1 to 13v8, 13w1 to 13w8) are arranged in a line in the order of the U phase, the V phase, and the W phase at the same height.

  Here, as shown in FIG. 15, the outer support point D of the insulator 12 has two points: an inner support point E after the assembly of the adjacent insulators 12 in phase and an inner support point F before the assembly. Is set so as to be located radially outside the perpendicular bisector G of the line segment S connecting the two. Further, the length L of the portion that becomes the transition portion 14T of the para-winding 14 before being assembled to the stator core 11 is set to a length substantially equal to the distance L1 between the inner support point E and the outer support point D. Thereby, when the coil 13 is inserted into the teeth 11b of the stator core 11, tension is applied to the transition portion 14T so that the coil 13 is not loosened.

  Next, assembly of the stator 10 will be described. Of the eight U-phase, V-phase, and W-phase coils 13u, 13v, 13w of the U-phase, V-phase, and W-phase coil groups 18u, 18v, 18w, first, the first U-phase, V-phase, and The insulators 12 of the W-phase coils 13u, 13v, 13w are sequentially inserted and assembled into the teeth 11b of the stator core 11 from the outside in the radial direction. Next, the insulators 12 of the second U-phase, V-phase, and W-phase coils 13u, 13v, and 13w are sequentially inserted and assembled in the counterclockwise three adjacent teeth 11b of the stator core 11 from the radially outer side. Thereafter, similarly, the third to eighth U-phase, V-phase, and W-phase coils of the insulator are inserted into the teeth 11b of the stator core 11 from the outside in the radial direction, and one turn of the stator 10 is assembled.

  Next, after assembling the eight U-phase, V-phase, and W-phase coils 13u, 13v, and 13w of the U-phase, V-phase, and W-phase coil groups 18u, 18v, and 18w, the para-winding 14u of the U-phase coil group 18u is assembled. Is connected to the U-phase connection terminal 15u, one end of the para-winding 14v of the V-phase coil group 18v is connected to the V-phase connection terminal 15v, and the para-winding 14w of the W-phase coil group 18w is connected. Is connected to the W-phase connection terminal 15w. Then, the other end of each para-winding 14u, 14v, 14w is connected to the midpoint terminal 16 (see FIG. 2).

  As a result, each coil 13 is connected to the second winding end 42 of the adjacent coil 13 with the first winding end 41 in the in-phase coil 13 straddling the coil 13 of the different phase via the crossing portion 14T. The stator 10 connected to the phase star is assembled.

  Here, as shown in FIGS. 2 and 16, the stator 10 has a holding clip 70 that collectively holds the transition portions 14 </ b> T of the eight U-phase, V-phase, and W-phase coils 13 u, 13 v, and 13 w. Is provided. The holding clip 70 is made of an insulating member such as rubber. As shown in FIG. 18, as shown in FIG. 18, an annular clip main body 71 and a cross holding portion 72 that holds the crossing portion 14 </ b> T at a predetermined interval in the circumferential direction of the clip main body 71. Is provided. The clip body 71 has a substantially rectangular cross section.

  As shown in FIG. 19, the crossing holding portion 72 protrudes from the clip body 71 to the coil 13 side in a columnar shape, and has an opening 73 on the surface facing the coil 13. A predetermined groove S is formed between two opposing holding walls 74 forming the opening 73, and the height (radial length) of this groove S is substantially wound as shown in FIG. The diameter of the wire is one, the depth (the length in the axial direction) is the diameter of about two windings, and the para-winding 14 constituting the crossing portion 14T arranged side by side in the axial direction. It is formed so that it can be accommodated.

  Further, the transition holding portion 72 is provided with a holding claw 75 at the tip of the holding wall 74 that forms the opening 73 so that the interval between the holding walls 74 is smaller than the diameter of one winding. This prevents the housed para-winding 14 from coming off.

  The holding clip 70 configured as described above is fitted so as to hold the substantially central portion between the outer support point D of the outer winding support portion 30 and the inner support point E of the inner winding support portion 34 of the transition portion 14T. Thus, the stomach when the crossing portion 14T vibrates can be restrained by the holding clip 70. By this restriction, it is possible to suppress the vibration of the transition portion 14T and to suppress the insulation failure due to the bending of the para-winding 14 and the friction with the other phase. Note that the holding clip 70 does not contact the side surface of the coil 13 on one axial end side.

  In addition, it is preferable to form the angles of the two holding walls 74 facing each other so as to be alternately different in the circumferential direction. As a result, the holding wall 74 against which the para-winding 14 is strongly applied becomes opposite between the adjacent crossing portions 14T, and the crossing portion 14T is held more firmly. Moreover, in the said embodiment, it is comprised so that the holding clip 70 may hold | maintain the approximate center part of the outer side support point D of the outer side winding support part 30 of the transition part 14T, and the inner side support point E of the inner side winding support part 34. However, the present invention is not limited to this, and the radial position at which the crossing portion 14T is held by the holding clip 70 may be alternately changed in the circumferential direction. This also makes it possible to hold the crossing portion 14T more firmly.

Second Embodiment
Next, the salient pole concentrated winding stator of the second embodiment will be described with reference to FIGS.
In the stator 10 of the electric motor 1 of the second embodiment, the length L of the portion that becomes the transition portion 14T of the para-winding 14 before the assembly to the stator core 11 in FIG. 15 is between the inner support point E and the outer support point D. It is set longer than the distance L1.

  When the stator 10 is assembled, as shown in FIG. 22, the U-phase, V-phase, and W-phase composed of a plurality of (eight) coils 13 wound continuously by the same para-winding 14 are used. Each of the coils 13u, 13v, 13w of each coil group 18u, 18v, 18w is arranged in an annular shape radially outwardly corresponding to the teeth 11b of the stator core 11, and all the coils 13 are The teeth 11b of the stator core 11 are inserted into the square holes 24a of the insulator 12 by simultaneously moving in the direction of reducing the diameter (arrow direction).

  When the coil 13 arranged in an annular shape outward in the radial direction of the stator core 11 moves in the reduced diameter direction, the length in the circumferential direction is shortened, so that the transition portion 14T is slackened, but the stator core is formed in the square hole 24a of the insulator 12. After the 11 teeth 11b are inserted, the crossover portion 14T is locked to the outer support point D of the outer winding support portion 30 and the inner support point E of the inner winding support portion 34, as shown in FIG. By bending and forming the transition portion 14T in a substantially S shape, the slack is absorbed and tension is applied to the transition portion 14T.

  As shown in FIGS. 20 and 22, the stator 10 of the second embodiment configured in this way also includes eight U-phase, V-phase, and W-phase coils 13 u, 13 v, and 13 w as a transition portion 14 </ b> T. A holding clip 70A is provided. The holding clip 70A is made of an insulating member such as rubber, and an annular clip body 71 and a transition holding portion 72 that holds the transition portion 14T are integrally formed. That is, the annular clip main body 71 is directly formed with a concave groove S as a cross holding portion 72.

  A concave groove S is formed in the crossing holding portion 72 so that a surface facing the coil 13 is opened. As shown in FIG. 23, the concave groove S has an S-shape substantially the same as the shape of the transition portion 14T, and holds the transition portion 14T including two bending points. In this holding clip 70 as well, the height (radial length) of the concave groove S is the diameter of approximately one winding, and the depth (axial length) is approximately the length of two windings. The distance between the holding walls 74 at the tip of the holding wall 74 that is a radial dimension and is formed so as to accommodate the para-winding 14 that constitutes the crossing portion 14T arranged side by side in the axial direction. The holding claw 75 is provided so that is narrower than the diameter of one winding.

  Similarly to the first embodiment, the holding clip 70 configured as described above can restrain the belly when the crossing portion 14T vibrates with the holding clip 70, thereby suppressing the vibration of the crossing portion 14T. It is possible to suppress insulation failure due to breakage of the winding 14 or rubbing with another phase.

  In addition, this invention is not limited to embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably.

1 Outer rotor type motor (motor)
4 Rotor 10 Stator (salient pole concentrated winding stator)
11 Stator core 11b Teeth 12 Insulator 13 Coil 13u U phase coil 13v V phase coil 13w W phase coil 14 Para winding (winding)
14T Crossover portion 14u U-phase parallel winding 14v V-phase parallel winding 14w W-phase parallel winding 30 Outer winding support portion 34 Inner winding support portion 41 First winding end 42 Second winding end 70, 70A Holding clip 72 Holding part 74 Holding wall 75 Holding claw

Claims (7)

A salient pole concentrated winding stator of a motor in which a winding is wound so that coils wound around adjacent teeth of a stator core are out of phase,
A coil wound around each of the teeth includes a first winding end located on the radially outer side on the one axial end side of the stator, and a second winding end located on the radially inner side on the one axial end side of the stator. Have
The first winding end of one of the coils of the same phase adjacent to each other and the second winding end of the other are connected by the same winding by a crossing portion across the coils of the different phase,
A salient pole concentrated winding stator of an electric motor, wherein a plurality of the transition portions provided in the circumferential direction are held together by a holding member. An outer winding support is provided radially outward from the first winding end;
An inner winding support is provided radially inward from the second winding end;
The crossover portion is locked on the radially outer side of the outer winding support portion on the first winding end side, and on the radially inner side of the inner winding support portion on the second winding end side,
The transition part is connected to the coils of the same phase adjacent to each other via the outer winding support part and the inner winding support part,
The holding member has a cross holding portion that opens on the side facing the coil in the axial direction,
The angle of the two holding walls sandwiching the crossing portion from both sides of the crossing holding portion is such that the apex of one of the outer winding support portions and the apex of the other inner winding support portion of the coils of the same phase adjacent to each other. The salient pole concentrated winding stator for an electric motor according to claim 1, wherein the stator is inclined in a circumferential direction from a connected straight line.   The salient pole concentrated winding stator for an electric motor according to claim 1, wherein the angles of the two holding walls are alternately different in the circumferential direction.   4. The salient pole concentrated winding stator for an electric motor according to claim 1, wherein radial positions at which the bridging portions are held by the holding member are alternately different in a circumferential direction. 5.   The holding member holds a substantially central portion of a locking position on the outer side in the radial direction of the outer winding support part and a locking position on the inner side in the radial direction of the inner winding support part. The salient pole concentrated winding stator of the electric motor of any one of Claims 1-3. The holding member has a cross holding portion that opens on the side facing the coil in the axial direction,
The crossover holding part has two holding walls that sandwich the crossover part from both sides,
Each of the two holding walls is provided with a holding claw at the opening end,
The salient pole concentrated winding stator according to any one of claims 1 to 5, wherein a gap between the holding claws is smaller than a diameter of a winding of the transition portion. The crossing portion is bent into a substantially S shape,
The salient pole concentrated winding stator for an electric motor according to any one of claims 1 to 6, wherein the holding member is opened along the shape of the crossing portion.